package com.epfresh.api.utils;

import android.text.InputFilter;
import android.text.Spanned;
import android.text.TextUtils;
import android.util.Log;
import android.widget.EditText;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author wangzhanghuan
 * @version 1.0
 * @date create 17-7-4
 * @Description 输入保持小数点位数
 */
public class PointerInputFilter implements InputFilter {
    Pattern mPattern;

    //输入的最大金额
    public double MAX_VALUE = Double.MAX_VALUE;
    public int MIN_VALUE = 0;
    //小数点后的位数
    private static final int POINTER_LENGTH = 2;

    private static final String POINTER = ".";

    private static final String ZERO = "0";

    public PointerInputFilter() {
        mPattern = Pattern.compile("([0-9]|\\.)*");
    }

    /**
     * @param source 新输入的字符串
     * @param start  新输入的字符串起始下标，一般为0
     * @param end    新输入的字符串终点下标，一般为source长度-1
     * @param dest   输入之前文本框内容
     * @param dstart 原内容起始坐标，一般为0
     * @param dend   原内容终点坐标，一般为dest长度-1
     * @return 输入内容
     */
    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        String sourceText = source.toString();
        String destText = dest.toString();

        //验证删除等按键
        if (TextUtils.isEmpty(sourceText)) {
            return "";
        }

        Matcher matcher = mPattern.matcher(source);
        //已经输入小数点的情况下，只能输入数字
        if (destText.contains(POINTER)) {
            if (!matcher.matches()) {
                return "";
            } else {
                if (POINTER.equals(source)) {  //只能输入一个小数点
                    return "";
                }
            }

            //验证小数点精度，保证小数点后只能输入两位
            int index = destText.indexOf(POINTER);

            int len = destText.length()-1;
            int length = dend - index;


            Log.e("POINTER_LENGTH","dend:"+dend);
            Log.e("POINTER_LENGTH","dest:"+dest);
            Log.e("POINTER_LENGTH","index:"+index);
            Log.e("POINTER_LENGTH","source:"+source);
            Log.e("POINTER_LENGTH","POINTER_LENGTH:"+length);
            if (length > POINTER_LENGTH) {
                return dest.subSequence(dstart, dend);
            }
        } else {
            //没有输入小数点的情况下，只能输入小数点和数字，但首位不能输入小数点和0
            if (!matcher.matches()) {
                return "";
            } else {
                if ((POINTER.equals(source) /*|| ZERO.equals(source)*/) && TextUtils.isEmpty(destText)) {
                    return "";
                }
            }
        }
        //验证输入金额的大小
        double sumText = Double.parseDouble(destText + sourceText);
        if (sumText > MAX_VALUE) {
            return dest.subSequence(dstart, dend);
        }
        return dest.subSequence(dstart, dend) + sourceText;
    }


    public static void d(EditText et, int max) {
        PointerInputFilter inputFilter = new PointerInputFilter();
        inputFilter.MAX_VALUE = max;
        et.setFilters(new InputFilter[]{inputFilter});
    }
}

